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What happened

More specifically, SINA's net revenue climbed 59% year over year to $440.8 million, which translated to adjusted (non-GAAP) net income of $35.2 million, or $0.47 per share. Both the top and bottom lines arrived ahead of investors' expectations for earnings of $0.42 per share on revenue of $433.3 million.

IMAGE SOURCE: SINA.

So what

SINA Chairman and CEO Charles Chao called it a "good start" to the year, noting that the company enjoyed "robust" revenue growth and improved monetization from Weibo, in which it owns a majority stake, and continued progress with mobile monetization from its portal business.

To be sure, SINA's advertising revenue soared 61% year over year this quarter to $440.8 million, driven by a 79% increase in Weibo ad and marketing sales. And non-advertising revenue jumped 47% to $73.7 million, led by a combination of Weibo gaming and membership services, as well as sales from SINA's budding fin-tech business.

Now what

It's unclear, then, exactly why SINA is falling today -- though that's not entirely out of character for the stock. In fact, you might recall that SINA shareholders endured similar post-earnings plunges in spite of strong quarterly results multipletimes en route to the stock's 65% gain for all of 2017. And for perspective, SINA was already up more than 35% over the past year as of yesterday's close.

So while today's market reaction might not indicate as much, these results were undeniably impressive. And I think long-term SINA shareholders have no reason to be worried.

Author

As a technology and consumer goods specialist for the Fool, Steve looks for responsible businesses that positively shape our lives. Then he invests accordingly. Enjoy his work? Connect with him on Twitter & Facebook so you don't miss a thing.